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  string(97) "Patterns of disease progression in patients with metastatic, castration-sensitive prostate cancer"
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  string(641) "In metastatic, castration-sensitive prostate cancer (mCSPC), treatment effectiveness is commonly assessed by prostate-specific antigen progression and radiographic progression. However, inconsistencies often arise between these events, especially in patients with mCSPC treated with the combination of androgen deprivation therapy and androgen receptor axis-targeted agents. Given the potential implications, gaining a deeper understanding of disease progression in this population is crucial. In this study, we use data from the TITAN trial to investigate the patterns of disease progression in patients with mCSPC treated with apalutamide."
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      string(210) "NCT02489318 - A Phase 3 Randomized, Placebo-controlled, Double-blind Study of Apalutamide Plus Androgen Deprivation Therapy (ADT) Versus ADT in Subjects With Metastatic Hormone-sensitive Prostate Cancer (mHSPC)"
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  ["property_scientific_abstract"]=>
  string(1502) "Background

Prostate-specific antigen (PSA) levels and radiographic examinations were common tools for treatment monitoring in patients with metastatic, castration-sensitive prostate cancer (mCSPC). Evidence showed a frequent discordance PSA progression and radiographic progression in patients with mCSPC, especially those treated with androgen deprivation therapy (ADT) and androgen receptor axis-targeted agents (ARATs). However, the patterns of disease progression, and their associations with overall survival (OS) in patients with mCSPC treated with ADT plus apalutamide are not well-characterized.

Objective

To investigate the patterns of disease progression in patients with mCSPC receiving ADT plus apalutamide.

Study Design

A post-hoc analysis, using data on the TITAN trial.

Participants

Patients with mCSPC, treated in combination with ADT and apalutamide or placebo who progressed as measured by PSA levels or radiographic examinations.

Main Outcome Measures

PSA progression-free survival (PSA-PFS), radiographic progression-free survival (RPFS), and OS as per the trial protocol.

Statistical Analysis

Descriptive statistics were used to summarize the types and patterns of disease progression. Particularly, baseline characteristics and the patterns of radiographic progressions with or without concurrent PSA progression were examined. The concordance of PSA-PFS and RPFS with OS were tested using c-statistics."
  ["project_brief_bg"]=>
  string(2102) "Androgen deprivation therapy (ADT), either alone or in combination with androgen receptor axis-targeted agents (ARATs) or cytotoxic chemotherapy, is the standard of care for advanced or metastatic prostate cancer.[1] The response to treatment is typically monitored through prostate-specific antigen (PSA) levels and radiographic examinations. However, in metastatic, castration-resistant prostate cancer (mCRPC), relying solely on PSA monitoring has proven insufficient for monitoring disease activity. Evidence suggests that a quarter of patients experience radiographic progression without corresponding PSA progression, as defined by the prostate cancer working group 2 definition.[2,3] Consequently, current guidelines recommend a combination of regular radiographic examinations and PSA measurements for assessing patients with mCRPC.[1] A majority of experts at the Advanced Prostate Cancer Consensus Conference Current also recommend regular radiographic examinations, regardless of PSA levels, for this population.[4]

In contrast, for metastatic, castration-sensitive prostate cancer (mCSPC), the current guidelines do not mandate regular radiographic examinations unless patients maintain stable PSA levels and are asymptomatic.[1] However, evidence suggest that discrepancies between PSA progression and radiographic progression also occur in patients with mCSPC treated with ADT.[5,6] Furthermore, a post-hoc analysis of data from a randomized controlled trial showed that this discrepancy can be more pronounced in patients treated with the combination of ADT and ARATs than in those treated with ADT and placebo.[5] However, the applicability of these findings to patients with mCSPC treated with ADT and other ARATs remains unclear. In this study, we use data from the TITAN trial to investigate the patterns of disease progression in patients with mCSPC treated with ADT plus apalutamide. Elucidating the patterns of disease progression in this population could facilitate the optimization of treatment strategies for patients with mCSPC receiving intensified systemic treatment."
  ["project_specific_aims"]=>
  string(899) "The primary aim of this study is to assess the patterns of disease progression in patients with metastatic, castration-sensitive prostate cancer treated with androgen deprivation therapy (ADT) and apalutamide. We propose the following hypotheses for this study:

1. Radiographic progression in the absence of prostate specific antigen (PSA) progression is more common in patients treated with the combination of ADT and apalutamide than in those treated with ADT plus placebo.

2. Radiographic progression without corresponding PSA progression is a worse prognostic factor for radiographic progression-free survival.

3. Baseline characteristics, specifically the site of baseline metastatic location, differ between patients developing radiographic progression with corresponding PSA progression and those developing radiographic progression without corresponding PSA progression."
  ["project_study_design"]=>
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    ["label"]=>
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  }
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  ["project_purposes"]=>
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  }
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  ["project_research_methods"]=>
  string(94) "Inclusion criteria: all patients in this trial

Exclusion criteria: missing outcome data"
  ["project_main_outcome_measure"]=>
  string(118) "Radiographic progression, prostate-specific antigen progression, and all-cause mortality as per the trial protocol.[7]"
  ["project_main_predictor_indep"]=>
  string(314) "The primary variable is radiographic progression, with the prostate-specific antigen (PSA) kinetics serving as a secondary variable. Values of PSA are assessed at three specific time points: the day when the nadir value is achieved, and the days within 30 days before and after confirming radiographic progression."
  ["project_other_variables_interest"]=>
  string(707) "The following variables will be included as covariates: age (categorical), race (categorical), Eastern Cooperative Oncology Group performance status (categorical), baseline prostate-specific antigen (continuous), Gleason score at diagnosis (categorical), reported pain scale (categorical), prior local therapy (categorical), presence of liver metastasis (categorical), presence of visceral metastasis (categorical), metastasis stage at initial diagnosis (categorical), baseline hemoglobin (continuous), baseline albumin (continuous), baseline alkaline phosphatase (continuous), and baseline lactate dehydrogenase (continuous), previous docetaxel use (categorical), and baseline disease volume (categorical)."
  ["project_stat_analysis_plan"]=>
  string(616) "Descriptive statistics will be employed to describe baseline characteristics, prostate-specific antigen (PSA) levels at radiographic progression, and the patterns of disease progression. Time-to-event outcomes will be depicted with Kaplan-Meier curves and compared using the log-rank test. The concordance of radiographic progression-free survival and PSA progression-free survival with overall survival will be determined using Harrell?s concordance index. Hazard ratios for all-cause mortality will be computed using Cox regression models, treating the patterns of disease progression as a time-dependent variable."
  ["project_timeline"]=>
  string(194) "Day 0: Approval of the project

Day 60: Data transfer

Day 120: Data processing

Day 150: Data analysis

Day 180: Manuscript writing

Day 210: Manuscript submission"
  ["project_dissemination_plan"]=>
  string(204) "The results of this project are expected to result in the development of a manuscript suitable for publication in a uro-oncology journal. Results will be presented at appropriate uro-oncology conferences."
  ["project_bibliography"]=>
  string(2253) "
[1] Cornford P, Van Den Bergh RCN, Briers E, Van Den Broeck T, Cumberbatch MG, De Santis M, et al. EAU-EANM-ESTRO-ESUR-SIOG Guidelines on Prostate Cancer. Part II?2020 Update: Treatment of Relapsing and Metastatic Prostate Cancer. European Urology 2021;79:263?82. https://doi.org/10.1016/j.eururo.2020.09.046.

[2] Scher HI, Halabi S, Tannock I, Morris M, Sternberg CN, Carducci MA, et al. Design and End Points of Clinical Trials for Patients With Progressive Prostate Cancer and Castrate Levels of Testosterone: Recommendations of the Prostate Cancer Clinical Trials Working Group. JCO 2008;26:1148?59. https://doi.org/10.1200/JCO.2007.12.4487.

[3] Bryce AH, Alumkal JJ, Armstrong A, Higano CS, Iversen P, Sternberg CN, et al. Radiographic progression with nonrising PSA in metastatic castration-resistant prostate cancer: post hoc analysis of PREVAIL. Prostate Cancer Prostatic Dis 2017;20:221?7. https://doi.org/10.1038/pcan.2016.71.

[4] Gillessen S, Bossi A, Davis ID, De Bono J, Fizazi K, James ND, et al. Management of patients with advanced prostate cancer?metastatic and/or castration-resistant prostate cancer: Report of the Advanced Prostate Cancer Consensus Conference (APCCC) 2022. European Journal of Cancer 2023;185:178?215. https://doi.org/10.1016/j.ejca.2023.02.018.

[5] Armstrong AJ, Mottet N, Iguchi T, Szmulewitz RZ, Holzbeierlein J, Villers A, et al. Radiographic progression in the absence of prostate-specific antigen (PSA) progression in patients with metastatic hormone-sensitive prostate cancer (mHSPC): Post hoc analysis of ARCHES. JCO 2022;40:5072?5072. https://doi.org/10.1200/JCO.2022.40.16_suppl.5072.

[6] Bryce AH, Chen YH, Liu G, Carducci MA, Jarrard DM, Garcia JA, et al. Patterns of Cancer Progression of Metastatic Hormone-sensitive Prostate Cancer in the ECOG3805 CHAARTED Trial. European Urology Oncology 2020;3:717?24. https://doi.org/10.1016/j.euo.2020.07.001.

[7] Chi KN, Chowdhury S, Bjartell A, Chung BH, Pereira de Santana Gomes AJ, Given R, et al. Apalutamide in Patients With Metastatic Castration-Sensitive Prostate Cancer: Final Survival Analysis of the Randomized, Double-Blind, Phase III TITAN Study. JCO 2021;39:2294?303. https://doi.org/10.1200/JCO.20.03488.
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data partner
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pi country
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pi affil
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}


products
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}


num of trials
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}


res
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}